If you want to dig in to deeper detai and your system/personnel supports it, that is fine. However, unless the ATTN or ICO person is an owner, they are a mere agent and you don't really need to do OFAC on them as part of CIP/AML. Please be careful what you start because examiners have been known to turn something like this into an expectation.
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My opinions are not legal advice and are worth what you paid for them.